Hydraulic rotary well boring tool



Patented Aug. 1, 1916 2 SHEETS-SHEET l.v

ma 5 a fm2@ a# L u l l w. L. DUNN. HYDRAULIC ROTARY WELL BORING TOOL.

n APPLlcATxoN mso MAR. 11.41913. 1,193,247. zzz/m g am' f W.1DUNN.HYDRAULIC'ROTARY WELL BORING TOOL.

APPLICATION F-ILED MAR. i7', 1'9l3.

Patented Aug. 1, 1916.

2 SHEETS-SHEET 2.

E I., 50 501 20 l 50 To all 'whom it may concern -wrLLrarc'V LINCOLNDUNN, or oxnann, c'snrronms, Assrenon ro THE DUNN MANU- FAcTUnINGcoursier, or ommen, camronnm, a conronafrron or CALIFORNIA HYDRAULICROTARY WELL-BORlNG TOOL.

1193247" l i specificati' Beit lmownthat I, WILLIAM L. DN,

.A a citizen .of the United States, residinor at Oxnard, inthe county ofVentura and Sttate of California, yhave invented a new and usefulHydraulic Rotary` Well-'Boring Tool, of

-which the following is a speciication. j Itfrequently occurs in boringoil wells y that thehole may be drilled to a depth of 10 'of insertingcasing, but that at such dept 2500. feet, more or less, without thenecessit' it becomes necessary to insert casing in order +o prevent thewalls of the hole trom caving. vand that after such casing has been 1n-`serted it is necessary to drili to a considerfable depth, sa 500 feet,moreor less, below the casing be ore the oil-bearing stratum isjreached, and that the intervening d/epth.

Inust'also finally be protected with casing.-

:Itis desirable, of course, that` the bore of the well be as large aspossible from toptol bottom, and an object of. thisinvention is to.provide a cheap, simple and effective hydraulic rotary boring tool bywhich the hole can-be drilled from start to finish, with the necessityonly of renewing from time to time cheap, conveniently replaced partswhich are sbjectto wear.

Strength and rigidity of construction, ease -and vconvenience of takingout and replacin the cuttlng parts, and'superlor eiiiciency o operationare further objects of' this inven-v t1on'.

Another object isfto so mountthe cutter 'blades as; to maximize theeffective cutting diameter of the blades so as to produce a bore of"muclr'greater diameter than the tool body,`and notwithstanding which-the blades may be folded within the compass of well casing'of butslightly largerdiameter .than the diameter of thetooll body.

. Other4 objects and advantages may ap'- prear as the invention isunfolded in the sub joined detail description.

The accompanying drawings illustrate the invention. j

Figure 1 is an elevation partly in section on irregular line indicatedby :vb- Fig. 2 of a tool constructed in accordance with this invention.Fig. 2 is a view at right angles to 'Fig 1, parts being broken away toexpos`e`interior construction. Fig. 3 is a view ofthe bottom end ofthetool. Fig. t is a View of the bottom of thetool, the blades being cutaway atA line s45-m4 Fig. 2. Fig.

seamen. recent-.ea Analisis.

Application filed March 17, i913. Serial No. 755,020.

5 is a view of the tool partly in longitudinal section on irregular lineindicated by ce1- m5 Fig.2 showin the tool when-collapsed for thepurpose oi passing through a casing, a

iragrnent of which is shown'in section. Fig.

6 is a view of the tool in operative position to form an excavation,which is indicated, below theiower end of the well casing, a fragment ofwhich is shown in sectionk Fig. 'i' is a face view o'one of the cutterblades together with its forked rod which is partly broken away tocontract the view. Fig.- 8V is an elevation of Fig. 7 looking at theright, hand edge of the vcutter blade. Fig. 9 is a plan section en lineindicated by ang-m9,

lao

Fig. 6. Figs. 10 and 11 are fragmentary longitudinal sections onlinesindicated by f ,mw-:12.1 and al1-m2 respectively, AFigs. 9.

and 12. Fig. 12 is a view of the bottom endv of the tooi body. I i Thebody or case l of the tool is provided at its upper end with atubular'couphng pin 2, the central bore 3 of which is extended lt 0 wardthe lower endof the body, and communicates with two outwardly anddownwardly sloping vbranclres4 opening at thebottom of said tool 'body'lat opposite sidesA of the Huid-planel thereof; Said branchesli are of.

less ldiameter than the bore 3, and mayv be variously constructed andthey-serve as nOZ.-

zles to direct streamsr of water as required 'underneath the body of thetool 'and outwardiy alongside. the cutter blades to loosen and washoutthe shale, clay, and other Ina- -terials which may be cut by the toolin its On opposite sides of a ydetermined midv plane indicated by theline a-a'in Figs. 3 and e, longitudinal slots 6 are provided, the

- sides of which are parallel, and the adjacent sides of which areformed substantially in said mid-plane. These slots terminaterespectively at their upper ends in. sockets 7 which are formed betweenouteredge wall seat-forming portions of the tool body and inner edgewalls 9 that are aslant relative to the axis of the tool, said inneryedgewalls slanting downwardly and inwardly andterminating at theirlower ends to. form guiding and stopping shoulders 10 belowA which theslots overlap one another. Laterai remounted in the slots t3,

said lateral recesses being curved at their lower edges as indicated atlr-l.

At points in the body and eccentric to the y longitiulinal axis oi' thebody sutliciently above the top of the sockets 7 to leave the springseats l5, there are provided spring chambers 16, `and the top of saidchambers communicate with andare aceessibletlirourh recesses 17 in andlocated on opposite sidjes of said body so that through said recessessprings 1S may be inserted to rest-on said spring seats.

I `lattaced overlapping cutting blades 19, which may together forni alaterally` expanding tan-like cutter of ish-tail shape at the lowerend,`are fitted and reciprocably respectively; and are provided withshanksz() to substantially t the slots (3 throughout a considerableextent thereot` said shaiiks terminating in tongues 21, perforated totorni bearings 2;. through which pins Q3 are inserted to pivotallycoiineet to the tongues of said blades the forked rods 2l that arescrewthreaded at `their upper ends audextend through the springs 18 andthrough Uwashei's 25 thereon to receive nuts by which the springs can beput under any desired tension to yieldingl)r hold the cutting blades upiii-the slotsiand sockets-as inlfigs. l and (S and to allow said blades`to be drawn dowiito slide and fold along-sident' one another as in Fig.

rlhe cuttingblades li) are provided on their outer edges with caseengaging shoul ders '27 which contact with the edges ot' the walls S and'troni said shoulders downward said blades are provided externally withruimer faces or shoulders 2S that diverge 'downwardly l`roni thelongitudinal axes of the blades to approximately a` transverse line.indicated at /1-1'1 Fig. l opposite to laterally oll'set shoulders 2S).30 which are formed ou the inner edges ot the blades to lit andalternately engage the guiding and stopping shoulders 1U and betweenwhich ,intershoulder seats 30 extend to fit the in ner edge walls 9 ot'the slots into which the blades may be inserted. Said guiding andstopping shoulders 10 come iiitoopposition with the correspondingshoulders :'29 and the edges ot' the walls 8 come into with thecorresponding shoulders 2i' and the inter-slioulder seatslO come intoopposition with the corresponding inner edge walls 9 so as tosimultaneously fit together when the shanks il() ot the bladesare fullydrawn up into the slots (l as in Fig. l: aud each blade is providedutils shank with a lateral stud ill to enter the lateral recess ll whenthe shank is thus fully seated in the slot and said stud tits the recessso as to prevent looscuess and displaccuicu ol' the blade whcu thusdrawn H11. '.l`lic curved recess opposition y edges 14 aid in quicklyswinging the blades lie into operating position; and' studs iil'therecesses serve as means to prevent the blades from s reading too faroutward.

The lades 19are' provided at their lowei;V

ends with curved and laterally extending cutting edges 32, the tips 33of which pro cutter blades between the runner faces 28` and the flare ofthe cutting edges at the tips 33 are practically parallel with the innervertical edges 35 which extend from the shoulders 29 to the inner tipsof thecutting edges, so thatwhen saidcutter blades are held :fullyseated in their slots 6 by the tension of the springs 18 tlieaxes of theblades and the inner edges 35 will be in parallelism with the producedavis of the tool body and the inner edges will overlap one another andthe cutting edges 32 will practically meet, as indicated in Figs. 1 and6.

Thecuttingedgesv 32 of the blades are of substantially the same lengthas the diameter of the body 1 so as to maximize the width or diameter ofthe cutting edges when the blades are in the operating position Fig. l6with their cutting edges projecting beyond the produced circumferentialplane of the body; and so as to fold along-side of one another withinsaid produced circumferential plane when the blades are in retractedposition Fig. 5. i

From the foregoing it is clear that by pivotally mounting the cutterblades 19 eccentric to the longitudinal axis of thebody 1 andsubstantially at the periphery of the body and by overlapping theblades. the total length or working diameter of- .the

i combined cutting edges 32 is but a trifle less the diameter of the`cutter body` the purpose of said offset being to allow" the cutterblade to be swung inwardlyl when the cutter blade is pulled downrelative to the tool body for that purpose. thus to retract the tips 33of the cutting edges from the produced -vertieal planes iii which the irunner faces :28 are brought when the blades are drawn downward; theresult beingthat when the blades are, inmtheipositioiis shown in Fig. 5the ruimer faces avill run on the inside ot' the casiugifl iaiulwdillhohl. the y cutter tips from engagbineiit :with the casing as thc tooldescends through the casing. it l|eing evident thatiafter the ruimerfaces have .v

` escapedfrom the lower `fend of the casing the springs 18 actinguponyexp-and the blades width 'l also-bring' the downwardly slantingshouldersQS underneath the casing to engage the the blades w' to theiroriginal cutting as `shown in Figs. l and 6; and will `sam`fandfslide-therepast, thus retracting 'itool from j f 18 thusdraw `theblades 19 upward the studs "the: blades into the running position shownias-ig.

5, when' it is desired to withdraw the below the casing. As the springs31 y ridinggon the. curved edges 1e of the blades may be withdrawn fromthe tool by out waiting for re-sharpening.

tion,

simply removing 19, With their the washers, nuts and and 438 and pullingthe blades forked rods Q4, out of the tool body l'whereupon said rodsmay be detached from the blades if desired and the blades sharpened ordiscarded, depending upon the amount` of wear that has occurred, itbeing understood that each blade may be repeatedly sharpened until theblade is practically worn out whereuponit is discarded.

It isobvious that as soonas the blades have been removed new bladesmaybe in stalled and the tool be put to' work withplugs 25, 26

I claim:

1. A rotary boring tool comprising a body having two substantiallyseparate longitudinal slots, overlapping cutter blades reciprocablymounted in and projecting from said slots, and means to hold the cutterblades outi ward when the blades are moved in one direcsaid blades beingprovided with runnerv facesextending substantially parallel to the axisof the body when the blades are folded.

2. A rotary boring tool comprising 'a body having two substantiallyseparate longitudinal slots with adjacent sides formed substantially ina single plane, and cutter blades projecting from said slots,'each bladehaving a shoulder to engage the body andprovided' downwardly from saidshoulder with a runner face diverging downwardly from thev longitudinalaxis of the blade. j

3. A rotary. boring tool comprising a body having vtwo substantiallyseparate longitudinal slots with adjacent sides formed substantially inthe mid-plane of said body, and

,overlapping cutter blades projecting from said slots to form runnerfaces along their outer edges adapted to project beyond the periphery ofthe body when the blades are o ut of commission. j v

2f 4. A rotary boring tool comprising a body having longitudinalslotsone on each side of the ax'is of the body with adjacent sides formedsubstantially in 'the `mid-plane of reciprocably mounted said body, andcutter blades projecting from said slots and overlapping one another,each of said blades having a shoulder on each `having two longitudinalslots, a shoulder 1n thelower end of each slot, and a cutter bladereciprocably mounted in each slot and provided vplth a shoulder toengage said slot shoulder when the cutter blade is moved in the slot.

6. A rotary boring tool comprising a body I,

having two longitudinalslots, a shoulder in the lower end of cach slot,and a cutter blade reciprocably mounted in each slot and provided withshoulders, one' of said blade of; uoriisoddo o'iui aquoaq Euieqslepjnoqs said slot shoulder when the blade is moved in one directionand the other blade shoulder being brought intoopposition to said slotshoulder when the blade is moved inthe op posite direction.

7 A rotary boring tool comprising a bodyl having two longitudinal slots,a shoulder in the lower endl of each slot, a cutter blade reciprocablymounted in each of said slots, means to move the cutter blades, andlaterally oll'set shoulders on each blade adapted to alternately engagesaid slot shoulder.,

8. A rotary boring tool comprising a body having two longitudinal slots,shoulders in opposite edges of each slot,l a cutter blade shoulders onopposite edges of each blade to simultaneously engage said slotshoulders.

9. A rotary boring tool comprising a body having Vtwo longitudinalslots, shoulders in opposite edges of each slot, a cutter bladereciprocably mounted in each slot, and shoulders on opposite edges and aseat on one edgeV of each of saidblades to simultaneously engage theslot shoulders and slot edge respectively.

10, A rotary boring `toolcomprising a body having two longitudinalslots, the wall of each slotbein provided with a lateral recess, acutter b aile reciprocably mounted in the slot and adapted to swingoutward, and lateral studs projecting fromthe blades to seat in theupper ends of the lateral recesses when the blades arey swung outward.11. A rotary boring. tool comprising a body having two longitudinalslots, the'wall in each slot, and

of each slot being proyided with a lateral recess, a cutter bladereciprocably mounted in each slot and adapted to swing outward, andlateral studs projecting from. the-blades to seat in the upper ends ofthe lateral recesses when the blades are swung outward, one oi' thewalls of each 'of said recesses being curved at its lower' edge.

121A rotary boring tool comprising a.'

a central bore, cutter blades atbody having the mid-plane of the body',ASaid tached along bore branching to 'the bottomcend of said body toopposite sides of said mid-plane close to the blades.

3. A rotary boring tool comprising a body having a central bore, cutterblades mounted along the mid-plane of said body, and outwardly directednozzles at the lower end of said bore and terminating in the lower endface of said body to direet streams of water along-sidethe cutterblades.

let. A rotary boring tool' comprising a body, and two cutter bladesindependently pivoted at di'erent sides of said body in a` planesubstantially midway between the in ner and outer edges of the bladesand adapted to fold alongside of one another.

15.- A rotary boring tool comprising a body, cutter blades adapted tooverlap one another, and pivots connecting the cutter blades to thebody, said pivots being eceentrie to one another in respect to thevertical axial planes ot' the pivots.

1G. A rotary boring tool comprising a body., cutter blades adapted tooverlap one another, and 'pivotseeonnecting the cutter blades totheriphery thereof.

A rotary boring tooly comprising' a i `12th day of March, 15H3.y

body at substantially the pepivotal relation to said body, and means tohold the cutter blad s outward, each of said blades having a sliou deron its outer edge to seat against the body and 'having a runner faceextending downward from saidi shoulder and diverging body, cutter oiaues1n WILLIAM LINCOLN DUNN,

In presence of JAMES R. TowNsnNo, Geenen l'l. limes e so that when thevanother and the cut-4

